Question

Suppose that you are given two sets of samples with the following information:

Sample Sample 2 n = 25 f = 23 y 28 SRE100 S 150 Syy= 250 n 20 i = 20 y 25 S 80 Say 120 Syy 200

(a) Estimate a linear regression equation for each sample separately and for the pooled sample. (b) State the assumptions under which estimation of the pooled regression is valid. (c) Explain how you will test the validity of these assumptions using the data provided.

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